The area of a circle is $64pi cm^2$ , how do you find its radius?

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Answer 1 · 2016-10-25T13:55:24

$r = 8 cm$

We know the formula for calculating the area of a circle is $A = pi * r^ 2$ where $r$ is the radius.

Substituting what we know:

$64 pi cm^2 = pi r^2$ we solve for $r$

$64 pi (cm^2) / pi = pi r^2 / pi$

$64 cm^2 = r^2$

$sqrt(64 cm^2) = sqrt(r^2)$

$r = 8 cm$

The area of a circle is 64pi cm^264pi cm^2, how do you find its radius?